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Installation and Maintenance 43
Note: Coil Connections available right or left hand (determined by
facing into air flow)
NOTE: THE PIPING PENETRATION INTO THE UNIT
CASING MUST BE SEALED BEFORE INSULATING.
FAILURE TO SEAL THE PENETRATION WILL PERMIT
INFILTRATION OF UNCONDITIONED AIR INTO THE
SECTION.
When subjected to freezing temperatures, provisions
must be made to protect coils that are not in use. See
section titled “Coil Winterization.”
NOTE: IF GLYCOL IS USED IN THE CHILLED WATER
OR HOT WATER SYSTEMS, BE SURE TO USE A
GLYCOL APPROVED FOR USE WITH COMMERCIAL
COOLING SYSTEMS AND COPPER TUBE COILS.
FOLLOW THE MANUFACTURER’S
RECOMMENDATIONS FOR WATER TREATMENT AND
MIX. FAILURE TO DO SO COULD AFFECT COIL
PERFORMANCE OR DAMAGE THE TUBES OR BRAZE
JOINTS.
Coils should be installed with field fitted drains and
vents to permit winterization of coils not in use, and
to assist in evacuating air from the chilled water
system during start-up.
CAUTION
Failure to properly protect coils
not in use during freezing temper-
atures may result in coil freeze-up
damage. Refer to the section titled
“Coil Winterization” for specific
instructions.
Steam Coil Piping
Figure 38
Typical Piping for Type NS Steam Coils and Horizontal Tubes
for Horizontal Airflow
Table 43
Coil Type W with 18, 24, 30 and 33” Headers and with Drain and Vent Locations Dimensions in inches
2-Row 4-Row 6-Row 8-Row
Coil Size A B C D E H F H F H F H F
18
6-3/4 9-3/4 19-1/2 8-1/4 11-1/4 6-1/2 4 9-1/2 7 12-1/2 10 15-1/2 13
24
9-3/4 12-3/4 25-1/2 11-1/4 14-1/4 6-1/2 4 9-1/2 7 12-1/2 10 15-1/2 13
30
12-3/4 15-3/4 31-1/2 14-1/4 17-1/4 6-1/2 4 9-1/2 7 12-1/2 10 15-1/2 13
33
14-1/4 17-1/4 34-1/2 15-3/4 18-3/4 6-1/2 4 9-1/2 7 12-1/2 10 15-1/2 13
Table 44
Coil Type W Coil Connections (Left and Right Hand) in inches
Header G
33
44.5
67.5
8 10.5
Code of System Components (Piping Diagrams
FT
Float and thermostatic steam trap
BT
Bucket steam trap
GV
Gate valve
OV
Automatic two-position (on-off) control valve
TV
Automatic three-way control valve
VB
Vacuum breaker
CV
Check valve
ST
Strainer
AV
Automatic or manual air vent